Deck editor;
Main: Each mana cost listed individually, not 0-1, 2-3, 4-5, 6+. 0 and 1 especially. I don't want lands doubling the # of choices while looking for one drops. 6+ can probably stay. Not sure on anyone else's feelings there.
Keywords: Haste, Exert, Cycling, Hexproof, First Strike, Double Strike, Deathtouch, Trample, Skulk, and in fact pretty much every combat keyword.
Creature Types: Minotaur. Come on, you guys put Cat in this set.
Mechanics: Card draw, Discard, Discard outlets, Can't be blocked, can't be countered, Land acceleration (specifically), -1/-1 counters, Direct Damage, Counterspells
Formats: EDH or Archenemy. Yes, I'm probably dreaming here.
2HG: Team chat. Sure, keep talking to opponent disabled to avoid having to deal with trash talk issues. But let teammates talk.
ETA: Counterspells, First Strike, Double Strike
Stainless: We put the "eff it" in "effort."
Warning to new people: Disregard me entirely and probably everything I post unless I tell you you're being a cockrhino or dickephant.